Inverter Reliability Workshop Accelerated Life Testing Rob Sorensen Sandia National Labs [email protected]505-844-5558 Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000 This work was performed under funding from the DOE Solar Energy Technologies Program.
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Accelerated Life Testing - Sandia Energy€¦ · Accelerated Life Testing Rob Sorensen Sandia National Labs. [email protected]. 505-844-5558. Sandia is a multiprogram laboratory
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Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000This work was performed under funding from the DOE Solar Energy Technologies Program.
Inverter Reliability Workshop
• No PV specific industry standard exists• HALT testing is spotty; independently applied• Separate needs identified for residential and commercial scale inverters • Failure modes identified but not in a uniform program applicable across the
industry • System predictive models will require inputs for inverters
Accelerated Aging for Inverters
Inverter Reliability Workshop
Laboratory testing provides vital information for PV system reliability
Field Data (O&M, Failures, …)
Accelerated Testing / Lab Tests
System performance model must include wear out (end of life) information
Rob SorensenSandia National Labs5/28/201010:46:25 AM
10 ug/cm2, 30C, 30% RH
ReliaSoft Weibull++ 7 - www.ReliaSoft.comReliability vs Time Plot
β=0.7073, η=5.2052, ρ=0.9889
Time, (t)
Relia
bility
, R(t)
=1-F(
t)
0.000 90.00018.000 36.000 54.000 72.0000.000
1.000
0.200
0.400
0.600
0.800
x 2
Reliability
Data 1Weibull-2PRRX SRM MED FMF=14/S=0
Data PointsReliability Line
Rob SorensenSandia National Labs5/28/201010:50:59 AM
20 ug/cm2, 30C, 80% RH
ReliaSoft Weibull++ 7 - www.ReliaSoft.comReliability vs Time Plot
β=2.0355, η=0.6531, γ=0.3818, ρ=0.9576
Time, (t)
Relia
bility
, R(t)
=1-F(
t)
0.000 3.0000.600 1.200 1.800 2.4000.000
1.000
0.200
0.400
0.600
0.800
x 2
x 2
x 3
x 2
Reliability
Data 1Weibull-3PRRX SRM MED FMF=13/S=0
Data PointsReliability Line
Rob SorensenSandia National Labs5/28/201010:57:34 AM
40 ug/cm2, 30C, 80%RH
• Provides distributions• Includes suspension results• Basis for models {Pfail = f(T, RH, [Cl])}
=
testMTTFMTTFAF field
Inverter Reliability Workshop
Bondpad corrosion is modeled as an additional series resistor
Voltage Comparator Circuit Prediction of the effect of corrosion on
LM185 reliability as f(storage location)
The distributed wirebond property (probability of failure) is input into an electrical system model & other component outcomes (reliability, performance threshold) can be determined
y p
0.97
0.975
0.98
0.985
0.99
0.995
1
0 20 40 60 80 100Time (years)
Desert
Gulf Coast
Arctic
Inverter Reliability Workshop
Laboratory testing provides vital information for PV system reliability
Field Data (O&M, Failures, …)
Accelerated Testing / Lab Tests
System performance model must include wear out (end of life) information